diff --git a/.changeset/brave-owls-gather.md b/.changeset/brave-owls-gather.md
new file mode 100644
index 000000000..d512677c3
--- /dev/null
+++ b/.changeset/brave-owls-gather.md
@@ -0,0 +1,19 @@
+---
+"@frontify/frontify-cli": minor
+---
+
+feat: add the `external` surfaces category with an `assetChooser` surface to the platform app manifest schema
+
+Its `title` is now validated like other surface titles (2 to 28 characters).
+
+```json
+{
+    "surfaces": {
+        "external": {
+            "assetChooser": {
+                "title": "My App"
+            }
+        }
+    }
+}
+```
diff --git a/packages/cli/src/utils/verifyManifest.ts b/packages/cli/src/utils/verifyManifest.ts
index 62bd75c60..e8b8b6014 100644
--- a/packages/cli/src/utils/verifyManifest.ts
+++ b/packages/cli/src/utils/verifyManifest.ts
@@ -225,6 +225,11 @@ export const platformAppManifestSchemaV1 = object({
             }).optional(),
             assetCreation: assetCreationShape,
         }).optional(),
+        external: object({
+            assetChooser: object({
+                title: string().min(2).max(28),
+            }).optional(),
+        }).optional(),
     }).optional(),
     metadata: object({
         version: number().int(),